Hack my fasting glucose!

I have been following a low carb primal diet for 6 months and, with the addition of lots of walking and hiking, have lost 60 lbs in the process! Prior to making this change my fasting glucose was running in the 110's, which prompted my search for a healthier diet. For the past few months, my fasting glucose has consistently been in the low 80s. Yesterday I went to a party and ate way off plan (sweets, bread, etc) and followed that up with Taco Bell for dinner. With the way I feel today I have definitely learned my lesson and am back on the straight and narrow. However my fasting glucose was 120 this morning. What does this huge jump mean physiologically? I am a little frightened by it!

Ok, you had some insulin resistance before going low carb, low-carb didn't cure it, you simply didn't have the dietary carbohydrate load to have high BG. Eating a significant carbohydrate load caused your BG to go up. No surprise.